Post by thread:[SX] Need Help With Switch De-Bounce

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, NAGCS wrote:

Here is a project I started a few days ago for the XBOX 360 The circuit uses RGB LED's Port RA.3 is used for switching patterns or colors. 3 Lines on the RB Ports switch the grounds on the RGB LED's. Port RC Controls the common Postive terminal of the RGB LED. I am having a big problem with switch bounce when I press the button I want to go cleanly to the next pattern not jump around. I will show some pictures then show the code if any one can help It would be great. http://www.newagepsx.com/images/uploads/3608.JPG http://www.newagepsx.com/images/uploads/3606.JPG http://www.newagepsx.com/images/uploads/3607.JPG http://www.newagepsx.com/images/uploads/3609.JPG http://www.newagepsx.com/images/uploads/innerringlight360.jpg http://www.newagepsx.com/images/uploads/360cb1.JPG http://www.newagepsx.com/images/uploads/360ip.JPG ' ------------------------------------------------------------------------- ' Device Settings ' ------------------------------------------------------------------------- DEVICE SX28, OSC4MHZ, TURBO, STACKX, OPTIONX FREQ 4_000_000 ' ------------------------------------------------------------------------- ' IO Pins ' ------------------------------------------------------------------------- Select VAR RA.3 ' Pattern Select TRIS_Sel VAR TRIS_A Blue VAR RB.0 Green VAR RB.1 Red VAR RB.2 Light VAR RC TRIS_Light VAR TRIS_C ' ------------------------------------------------------------------------- ' Constants ' ------------------------------------------------------------------------- Delay CON 100 ' 180 ms between steps Delay1 CON 80 ' 220 ms between steps ' ------------------------------------------------------------------------- ' Variables ' ------------------------------------------------------------------------- maxSteps VAR Byte ' steps in sequence idx VAR Byte ' step pointer ' ========================================================================= PROGRAM Start ' ========================================================================= Pattern0: DATA 8 DATA %11111110 DATA %11111101 DATA %11111011 DATA %11110111 DATA %11101111 DATA %11011111 DATA %10111111 DATA %01111111 Pattern1: DATA 8 DATA %01111111 DATA %10111111 DATA %11011111 DATA %11101111 DATA %11110111 DATA %11111011 DATA %11111101 DATA %11111110 ' ------------------------------------------------------------------------- ' Program Code ' ------------------------------------------------------------------------- Start: Light = %00000000 TRIS_Light = %00000000 Main: PAUSE Delay HIGH Red READ Pattern0. maxSteps IF idx <= maxSteps THEN S2_Go idx = 1 S2_Go: READ Pattern0 + idx, Light idx + idx + 1 TOGGLE Red PAUSE 200 HIGH Green READ Pattern0. maxSteps IF idx <= maxSteps THEN S3_Go idx = 1 S3_Go: READ Pattern0 + idx, Light idx + idx + 1 TOGGLE Green PAUSE 200 HIGH Blue READ Pattern0. maxSteps IF idx <= maxSteps THEN S4_Go idx = 1 S4_Go: READ Pattern0 + idx, Light idx + idx + 1 TOGGLE Blue PAUSE 200 IF Select = 0 THEN Main0 PAUSE 50 GOTO Main Main0: PAUSE Delay1 HIGH Green READ Pattern0, maxSteps IF idx <= maxSteps THEN S5_Go idx = 1 S5_Go: READ Pattern0 + idx, Light idx = idx + 1 PAUSE 25 IF Select = 0 Then Main1 GOTO Main0 Main1: PAUSE Delay1 HIGH Blue READ Pattern0, maxSteps IF idx <= maxSteps THEN S6_Go idx = 1 S6_Go: READ Pattern0 + idx, Light idx = idx + 1 PAUSE 25 IF Select = 0 Then Main2 GOTO Main1 Main2: PAUSE Delay1 HIGH Red READ Pattern0, maxSteps IF idx <= maxSteps THEN S7_Go idx = 1 S7_Go: READ Pattern0 + idx, Light idx = idx + 1 PAUSE 25 IF Select = 0 Then Main3 GOTO Main2 Main3: PAUSE 200 If Select = 0 THEN Main Light = %11111111 GOTO Main3 ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=126640 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Electronegativity wrote:Hi NAGCS. That project looks awesome! The easiest thing to do is wait for a millisecond between checking to see if a key is pressed. That is a conservative value and should work fine, but you can play around with reducing the delay to find out what the actual timescale of bouncing is. Good Luck.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:Now there is someone who knows how to post a question. Nice job, described the exact problem, post ALL the code and even showed the PCB. NAGCS, I see you have PAUSE 200, but I don't quite follow your select logic ? Is select = 0 when the button is pressed or does it equal 1 when the button is pressed ? BTW: If you download the latest version of SX/B you use IF...THEN...ENDIF blocks instead of all the GOTOs and labels. Also has DO...LOOP loops. Would make the code alot easier to follow. Bean.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, NAGCS wrote:If Select = 0 Basicly means if there is a ground pulse or (0) on RA.3 switch to the next subroutine. I was wondering if PULSEIN would be a better command but I don't know how to use it right. I am just a beginner when it comes to SXBASIC I excell in the hardware aspect but programming is a struggle for me. Basicly when powered up the circuit displays the first routine. When the NO Push button is pressed a ground is sent to RA.3 sending it to the next routine. There is a 10k pull-up resistor on the input to B+. I was wondering also if I have the input circuitry right. I also tried a transistor debounce circuit with no betters results.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:Okay, the part I don't understand is here: S7_Go: READ Pattern0 + idx, Light idx = idx + 1 PAUSE 25 IF Select = 0 Then Main3 GOTO Main2 Main3: PAUSE 200 If Select = 0 THEN Main Light = %11111111 GOTO Main3 After the PAUSE 25, you are saying if the button is pressed then goto Main3. So let's assume the button is pressed, now we are at Main3, if the user releases the button during the PAUSE 200 you will be stuck in the Main3 loop forever.Bean.

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